21112444434 has 32 divisors (see below), whose sum is σ = 44461440000. Its totient is φ = 6664959504.

The previous prime is 21112444427. The next prime is 21112444481. The reversal of 21112444434 is 43444421112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350467 + ... + 406265.

It is an arithmetic number, because the mean of its divisors is an integer number (1389420000).

Almost surely, 2^21112444434 is an apocalyptic number.

21112444434 is an abundant number, since it is smaller than the sum of its proper divisors (23348995566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112444434 is a wasteful number, since it uses less digits than its factorization.

21112444434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59142.

The product of its digits is 12288, while the sum is 30.

Adding to 21112444434 its reverse (43444421112), we get a palindrome (64556865546).

The spelling of 21112444434 in words is "twenty-one billion, one hundred twelve million, four hundred forty-four thousand, four hundred thirty-four".